This is a mounmental contribution to the field of diseases of the heart and blood vessels. It covers the modern point of view fully. This is important, since the subject has undergone considerable change in the past two decades as regards (1) the aspects of cardiovascular fields emphasized, (2) the substitution of the functional for the purely morphologic point of view. These changes are clearly reflected in this treatise. The sixty-two chapters of this two volume textbook are contributed by fifty-six eminent American authorities, the majority of whom have themselves advanced the knowledge of the subdivision about which they write. Being, almost without exception, clinicians as well as investigators, they write from the practical side based on experience in handling patients. They have thus presented the practical information for diagnosis and therapy in addition to the general concepts of diseases of the heart and blood vessels. The influence of the